Learn Polish: Teraz ten rekwizyt leży na scenie. - Now this prop is lying on the stage.

Leży comes from leżeć, which is a positional verb meaning to be in a lying position. It describes a static state. Its pair is the causative verb kłaść (to put or lay). Since the prop is just resting there on its own rather than being placed by someone, we use the static verb leży.

Why is the stage in the Locative case (na scenie) instead of the Accusative (na scenę)?

Because leży describes a static position rather than motion toward a destination. When answering the question where? (gdzie?) with a static verb, prepositions like na require the Locative case. If someone were actively putting the prop onto the stage (a destination), we would use the Accusative case.

How do we know the gender of rekwizyt?

We can tell it is a masculine noun because it is paired with the masculine pronoun ten (this). Specifically, it is masculine inanimate. While most Polish nouns ending in a consonant are masculine, spotting the modifier ten is the safest way to confirm it.

What triggers the spelling change from scena to scenie?